Temperature and frequency dependent dielectric capacitance and polarization performances of low dimensional perovskite based manganese stannate
Sarit K. Ghosh, Kaushik Mallick
Abstract
Abstract Manganese stannate perovskite nanoparticles were synthesized by applying a complexation mediated approach. Rietveld refinement of the XRD data exhibited orthorhombic structure with space group of Pnma. The structure included eightfold coordinated Mn 2+ cation, surrounded by eight O 2− anions and formed MnO 8 polyhedra unit. Each polyhedra unit interconnected through the corner-sharing SnO 6 octahedra with the formation of a cage-like network. The temperature and frequency dependent dielectric performances of manganese stannate were measured in the form of a device, which exhibited maximum dielectric constant value ~ 3445. The high dielectric constant value was originated due to the contribution of space charge polarization and orientation polarization of dipoles within the measured frequency ranges. Temperature and frequency dependent AC-conduction mechanism of the manganese stannate-based device involved both overlapping large polarons and non-overlapping small polarons. Electric field-dependent of polarization hysteresis loop of the device exhibited the maximum polarization value 1.5 µC/cm 2 under the electric field of 3 kV/mm. Under the applied field of 2 kV/mm, the device exhibited a fatigue-free polarization with a maximum value of 0.92 µC/cm 2 , sustained for 10 3 cycles under ambient temperature condition.